package com.winning.juc;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class TestProductorAndConsumerForLock {

    public static void main(String[] args) {

        Clerk clerk = new Clerk();
        Consumer consumer = new Consumer(clerk);
        Productor productor = new Productor(clerk);

        new Thread(productor,"生产者A").start();
        new Thread(consumer,"消费者B").start();
        new Thread(productor,"生产者C").start();
        new Thread(consumer,"消费者D").start();

    }

}


class Clerk{

    private int goods = 0;
    private Lock lock = new ReentrantLock();
    Condition condition = lock.newCondition();

    /**
     * 进货
     */
    public void get(){
        lock.lock();

        try{
            while(goods>=1){
                System.out.println("库存已满！");
                condition.await();
            }
            System.out.println(Thread.currentThread().getName() + " : " + ++goods);

            condition.signalAll();

        } catch (InterruptedException e) {
        } finally {
            lock.unlock();
        }
    }

    /**
     * 卖货
     */
    public void sale(){
        lock.lock();

        try{
            while(goods<=0){
                System.out.println("仓库无货！");
                condition.await();
            }
            System.out.println(Thread.currentThread().getName() + " : " + --goods);

            condition.signalAll();

        } catch (InterruptedException e) {
        } finally {
            lock.unlock();
        }
    }
}


class Productor implements Runnable{

    private Clerk clerk;

    public Productor(Clerk clerk){
        this.clerk = clerk;
    }


    @Override
    public void run() {

        for (int i = 0; i < 20; i++) {
            clerk.get();
        }

    }
}

class Consumer implements Runnable{

    private Clerk clerk;

    public Consumer(Clerk clerk){
        this.clerk = clerk;
    }

    @Override
    public void run() {

        for (int i = 0; i < 20; i++) {
            clerk.sale();
        }

    }
}